User`s guide

Troubleshooting Maintaining I/O Connectivity - 5
Maintaining I/O Connectivity
Remove the printer interface cable and temporarily install a
Quadra 900/950 floppy drive 20-pin cable between connectors A
and B in the diagram on the next page. This cable has the extra
length needed for the I/O shield to rest flat on the work surface.
Note:
Do not disconnect power supply cable J15, the I/O-CPU
cabling, or the AC power cable.